The Bitstamp exchange market for Bitcoin suspended all transfers today after it was hit by a DDoS attack. The DDoS attack exploits a wallet “misunderstanding” and is disrupting balance checking due to the malleability of transactions, the market said.

A 22—year-old Missouri man was sentenced to 36 months’ probation for his part in the DDoS attack by hacktivist group Anonymous against Angel Soft, a subsidiary of Koch Industries, according to Softpedia News.

Cyber criminals are using distributed denial of service (DDoS) attacks to tamper with market values and exchange platforms, according to Prolexic, a computer security company specialized in fending of such attacks.

Turkish hacktivist group RedHack announced it breached the systems of three major IT&telecom companies, including Vodafone, Turkish ISP TTNet, and Turkish mobile operator Turkcell, according to ehackingnews.com.

Usernames and passwords of 22,421 small-business customers from phone company Bell Canada were leaked after a hacker gained access to the systems of an Ottawa-based third party, according to Bell’s press release. The company said details of five credit cards were also leaked.